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Experimental data for CH3SH (Methanethiol)

22 02 02 11 45
Other names
Mercaptan methylique; Mercaptomethane; Methaanthiol; Methanethiol; Methanthiol; Methvtiolo; Methyl mercaptan; Methyl sulfhydrate; Methyl thioalcohol; Methylmercaptaan; Metilmercaptano; Thiomethanol;
INChI INChIKey SMILES IUPAC name
InChI=1S/CH4S/c1-2/h2H,1H3 LSDPWZHWYPCBBB-UHFFFAOYSA-N CS Methanethiol
State Conformation
1A' CS
Enthalpy of formation (Hfg), Entropy, Integrated heat capacity (0 K to 298.15 K) (HH), Heat Capacity (Cp)
Property Value Uncertainty units Reference Comment
Hfg(298.15K) enthalpy of formation -22.84 0.59 kJ mol-1 webbook
Hfg(0K) enthalpy of formation -11.88 0.59 kJ mol-1 webbook
Entropy (298.15K) entropy 255.14   J K-1 mol-1 webbook
Integrated Heat Capacity (0 to 298.15K) integrated heat capacity 12.10   kJ mol-1 webbook
Heat Capacity (298.15K) heat capacity 50.26   J K-1 mol-1 TRC
Information can also be found for this species in the NIST Chemistry Webbook
Vibrational levels (cm-1) vibrations
Mode Number Symmetry Frequency Intensity Comment Description
Fundamental(cm-1) Harmonic(cm-1) Reference (km mol-1) unc. Reference
1 A' 3000   1974sve/kov      
2 A' 2931   1974sve/kov      
3 A' 2597   1974sve/kov      
4 A' 1475   1974sve/kov      
5 A' 1335   1974sve/kov      
6 A' 1074   1974sve/kov       976 switched from mode 11
7 A' 803   1974sve/kov      
8 A' 708   1974sve/kov      
9 A" 3000   1974sve/kov      
10 A" 1430   1974sve/kov      
11 A" 976   1974sve/kov       1074 switched from mode 6

Calculated vibrational frequencies for CH3SH (Methanethiol).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
3.42541 0.43188 0.41316 1999Bet/Sas:789

Calculated rotational constants for CH3SH (Methanethiol).
Product of moments of inertia moments of inertia
7837.875amu3Å6   3.58894124003262E-116gm3 cm6
Geometric Data
picture of Methanethiol

Point Group Cs


Internal coordinates
distances (r) in Å, angles (a) in degrees, dihedrals (d) in degrees
Description Value unc. Connectivity Reference Comment
Atom 1 Atom 2 Atom 3 Atom 4
rCS 1.818   1 2 1966Herzberg
rCH 1.104   1 4 1966Herzberg
rSH 1.329   2 3 1966Herzberg
aHCH 110.3 4 1 5 1966Herzberg
aHSC 100.3 1 2 3 1966Herzberg

Cartesians
Atom x (Å) y (Å) z (Å)
C1 -0.8500 -0.0344 -0.2000
S2 0.9000 -0.5125 -0.1219
H3 1.4219 0.5781 0.4250
H4 -0.9406 0.8688 -0.8219
H5 -1.4219 -0.8688 -0.6469
H6 -1.2031 0.1656 0.8219

Atom - Atom Distances bond lengths
Distances in Å
  C1 S2 H3 H4 H5 H6
C1   1.81582.43461.10031.10591.0995
S2 1.8158   1.32702.40542.40702.4028
H3 2.43461.3270   2.68713.36592.6867
H4 1.10032.40542.6871   1.81141.8070
H5 1.10592.40703.36591.8114   1.8097
H6 1.09952.40282.68671.80701.8097  

Calculated geometries for CH3SH (Methanethiol).

Experimental Bond Angles (degrees) from cartesians bond angles

atom1 atom2 atom3 angle         atom1 atom2 atom3 angle
C1 S2 H3 100.390 S2 C1 H4 108.653
S2 C1 H5 108.488 S2 C1 H6 108.508
H4 C1 H5 110.385 H4 C1 H6 110.459
H5 C1 H6 110.287

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
C-S 1
H-C 3
H-S 1

Connectivity
Atom 1 Atom 2
C1 S2
C1 H4
C1 H5
C1 H6
S2 H3
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description
0 1   1A'

Ionization Energies (eV)
Ionization Energy I.E. unc. vertical I.E. v.I.E. unc. reference
9.439 0.005 9.440   webbook

Proton Affinity (kJ mol-1)
Proton Affinity unc. Product reference comment
773.4   CH3SH2+ webbook  
Dipole, Quadrupole and Polarizability
Electric dipole moment dipole
State Config State description Conf description Exp. min. Dipole (Debye) Reference comment Point Group Components
x y z total dipole quadrupole
1 1 1A' Cs True       1.520 NSRDS-NBS10 MW Cs 2 3
Experimental dipole measurement abbreviations: MW microwave; DT Dielectric with Temperature variation; DR Indirect (usually an upper limit); MB Molecular beam
Calculated electric dipole moments for CH3SH (Methanethiol).
Electric quadrupole moment quadrupole
State Config State description Conf description Exp. min. Quadrupole (D Å) Reference comment Point Group Components
xx yy zz dipole quadrupole
1 1 1A' Cs True       Cs 2 3

Calculated electric quadrupole moments for CH3SH (Methanethiol).
Electric dipole polarizability (Å3) polarizability
alpha unc. Reference
5.186 0.326 2015Tha/Wu:144302

Calculated electric dipole polarizability for CH3SH (Methanethiol).

References
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squib reference DOI
1966Herzberg Herzberg, G., Electronic spectra and electronic structure of polyatomic molecules,Van Nostrand,New York, 1966  
1974sve/kov L.M. Sverdlov, M. A. Kovner, E. P. Krainov, "Vibrational Spectra of Polyatomic Molecules" Wiley, New York 1974  
1999Bet/Sas:789 FL Bettens, KVLN Sastry, E Herbst, S Albert, LC Osterling, FC De Lucia. "The millmeter- and submillimeter-wave spectrum of methyl mercaptan (CH3SH)" Astrophysical J. 510, 789-794, 1999 10.1086/306633
2015Tha/Wu:144302 AJ Thakkar, T Wu "How well do static electronic dipole polarizabilities from gas-phase experiments compare with density functional and MP2 computations?" J. Chem. Phys. 143, 144302 (2015) 10.1063/1.4932594
NSRDS-NBS10 R. D. Nelson Jr., D. R. Lide, A. A. Maryott "Selected Values of electric dipole moments for molecules in the gas phase" NSRDS-NBS10, 1967 10.6028/NBS.NSRDS.10
TRC Frenkel, M; Marsh, K.N.; Wilhoit, R.C.; Kabo, G.J.; Roganov, G.N.,Thermodynamics of Organic Compounds in the Gas State,Thermodynamics Research Center, College Station, TX, 1994  
webbook NIST Chemistry Webbook (http://webbook.nist.gov/chemistry) 10.18434/T4D303

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